North Korea fired two suspected short-range ballistic missiles into the Sea of Japan on Thursday, the South Korean military reported.

The launches occurred at 8 am and 8.05 am local time (23:00/23:05 GMT Wednesday) from around the east coast city of Hamhung, and they flew about 190 kilometers at a top altitude of 20km, Seoul's Joint Chiefs of Staff (JCS) said.

The JCS added that Seoul and Washington continue to analyze the North's movements and the launches, which took place after the regime fired two suspected cruise missiles on Tuesday.

It is presumed that Pyonyang was targeting an uninhabited island off the country's east coast, an unnamed military official cited by Yonhap news agency said.

Japan's Prime Minister Fumio Kishida noted this was North Korea's sixth test of the year and that it was "very regrettable," adding that ballistic missiles are in breach of United Nations Security Council resolutions. He said Tokyo has lodged protests with Pyongyang.